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Editorial Team
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Asked: 2026-06-02T15:37:08+00:00

I am converting an older data set to schema/xml. It contains a few elements

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I am converting an older data set to schema/xml. It contains a few elements that are arrays with default values. I am close to a solution with xs:list; 

    <xs:element name="pressure"
            default="0.22 0.33 0.44 0.55 0.66 0.77 0.88 0.88 0.88 0.88">
  <xs:simpleType>
    <xs:list>
      <xs:simpleType>
        <xs:restriction base="xs:float">
           <xs:minInclusive value="0.0" />
           <xs:maxInclusive value="2.0" />
        </xs:restriction>
      </xs:simpleType>
    </xs:list>
  </xs:simpleType>
</xs:element>

How can i limit the length of the list to 10? I.e., where in this would I put the 

    <xs:length value="10">?
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1 Answer

  1. Editorial Team

    The base type is a xs:restriction on xs:float.

    <xs:simpleType name="ptype">
  <xs:restriction base="xs:float">
    <xs:minInclusive value="0.0" />
    <xs:maxInclusive value="2.0" />
  </xs:restriction>
</xs:simpleType>

    This is wrapped in an xs:list. 

    <xs:simpleType name="ltype">
  <xs:list itemType="ptype"/>
</xs:simpleType>

    Next, place a length restriction on the list.

    <xs:simpleType name="rtype">
  <xs:restriction base="ltype">
    <xs:length value="10"/>
  </xs:restriction>
</xs:simpleType>

    Finally, the element, with the default values

    <xs:element name="pressure"
    default="0.22 0.33 0.44 0.55 0.66 0.77 0.88 0.88 0.88 0.88">
  <xs:simpleType>
    <xs:restriction base="rtype"/>
  </xs:simpleType>
</xs:element>

    TO get the fully anonymous element, start at the top, and nest each construct into the next lower construct which references it. Finally, ended up with this;

    <xs:element name="pressure"
        default="0.22 0.33 0.44 0.55 0.66 0.77 0.88 0.88 0.88 0.88">
  <xs:simpleType>
    <xs:restriction>
      <xs:simpleType>
        <xs:list>
          <xs:simpleType>
            <xs:restriction base="xs:float">
               <xs:minInclusive value="0.0" />
               <xs:maxInclusive value="2.0" />
            </xs:restriction>
          </xs:simpleType>
        </xs:list>
      </xs:simpleType>
      <xs:length value="10"/>
    </xs:restriction>
  </xs:simpleType>
</xs:element>
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